“dark matter” is science talk for “we have no clue what that stuff is...”
;-)
Yes, but more to the point, we know in physics exactly what kind of filaments form helical pairs that rotate around each other, and we can duplicate the same behavior in the lab that they are observing in these galactic filaments. They are plasma filaments, not dark matter. It’s electromagnetic interaction that causes the rotation, which is completely explainable with plasma filaments, whereas “dark matter filaments” wouldn’t offer any explanation for the rotation at all.